#include<stdio.h>
#include<string.h>
#include<unistd.h>
int main()
{
  //C库函数
  printf("hello printf\n");
  fprintf(stdout,"hello fprintf\n");
  const char *message = "hello fwrite\n";
  fwrite(message,1,strlen(message),stdout);

  //系统调用
  const char *w = "hello write\n";
  write(1,w,strlen(w));

  fork();//创建子进程
  return 0;
}
